Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.jclouds.http.okhttp; import static com.google.common.base.Preconditions.checkNotNull; import static com.google.common.net.HttpHeaders.ACCEPT; import static com.google.common.net.HttpHeaders.USER_AGENT; import static org.jclouds.http.HttpUtils.filterOutContentHeaders; import static org.jclouds.io.Payloads.newInputStreamPayload; import java.io.IOException; import java.net.Proxy; import java.net.URI; import java.util.Map; import okio.BufferedSink; import okio.Okio; import okio.Source; import org.jclouds.JcloudsVersion; import org.jclouds.http.HttpRequest; import org.jclouds.http.HttpResponse; import org.jclouds.http.HttpUtils; import org.jclouds.http.IOExceptionRetryHandler; import org.jclouds.http.handlers.DelegatingErrorHandler; import org.jclouds.http.handlers.DelegatingRetryHandler; import org.jclouds.http.internal.BaseHttpCommandExecutorService; import org.jclouds.http.internal.HttpWire; import org.jclouds.io.ContentMetadataCodec; import org.jclouds.io.MutableContentMetadata; import org.jclouds.io.Payload; import com.google.common.base.Function; import com.google.common.collect.ImmutableMultimap; import com.google.common.collect.ImmutableMultimap.Builder; import com.google.inject.Inject; import com.squareup.okhttp.Headers; import com.squareup.okhttp.MediaType; import com.squareup.okhttp.OkHttpClient; import com.squareup.okhttp.Request; import com.squareup.okhttp.RequestBody; import com.squareup.okhttp.Response; public final class OkHttpCommandExecutorService extends BaseHttpCommandExecutorService<Request> { private static final String DEFAULT_USER_AGENT = String.format("jclouds-okhttp/%s java/%s", JcloudsVersion.get(), System.getProperty("java.version")); private final Function<URI, Proxy> proxyForURI; private final OkHttpClient globalClient; @Inject OkHttpCommandExecutorService(HttpUtils utils, ContentMetadataCodec contentMetadataCodec, DelegatingRetryHandler retryHandler, IOExceptionRetryHandler ioRetryHandler, DelegatingErrorHandler errorHandler, HttpWire wire, Function<URI, Proxy> proxyForURI, OkHttpClient okHttpClient) { super(utils, contentMetadataCodec, retryHandler, ioRetryHandler, errorHandler, wire); this.proxyForURI = proxyForURI; this.globalClient = okHttpClient; } @Override protected Request convert(HttpRequest request) throws IOException, InterruptedException { Request.Builder builder = new Request.Builder(); builder.url(request.getEndpoint().toString()); populateHeaders(request, builder); RequestBody body = null; Payload payload = request.getPayload(); if (payload != null) { Long length = checkNotNull(payload.getContentMetadata().getContentLength(), "payload.getContentLength"); if (length > 0) { body = generateRequestBody(request, payload); } } builder.method(request.getMethod(), body); return builder.build(); } protected void populateHeaders(HttpRequest request, Request.Builder builder) { // OkHttp does not set the Accept header if not present in the request. // Make sure we send a flexible one. if (request.getFirstHeaderOrNull(ACCEPT) == null) { builder.addHeader(ACCEPT, "*/*"); } if (request.getFirstHeaderOrNull(USER_AGENT) == null) { builder.addHeader(USER_AGENT, DEFAULT_USER_AGENT); } for (Map.Entry<String, String> entry : request.getHeaders().entries()) { builder.addHeader(entry.getKey(), entry.getValue()); } if (request.getPayload() != null) { MutableContentMetadata md = request.getPayload().getContentMetadata(); for (Map.Entry<String, String> entry : contentMetadataCodec.toHeaders(md).entries()) { builder.addHeader(entry.getKey(), entry.getValue()); } } } protected RequestBody generateRequestBody(final HttpRequest request, final Payload payload) { checkNotNull(payload.getContentMetadata().getContentType(), "payload.getContentType"); return new RequestBody() { @Override public void writeTo(BufferedSink sink) throws IOException { Source source = Okio.source(payload.openStream()); try { sink.writeAll(source); } catch (IOException ex) { logger.error(ex, "error writing bytes to %s", request.getEndpoint()); throw ex; } finally { source.close(); } } @Override public MediaType contentType() { return MediaType.parse(payload.getContentMetadata().getContentType()); } }; } @Override protected HttpResponse invoke(Request nativeRequest) throws IOException, InterruptedException { OkHttpClient requestScopedClient = globalClient.clone(); requestScopedClient.setProxy(proxyForURI.apply(nativeRequest.uri())); Response response = requestScopedClient.newCall(nativeRequest).execute(); HttpResponse.Builder<?> builder = HttpResponse.builder(); builder.statusCode(response.code()); builder.message(response.message()); Builder<String, String> headerBuilder = ImmutableMultimap.builder(); Headers responseHeaders = response.headers(); for (String header : responseHeaders.names()) { headerBuilder.putAll(header, responseHeaders.values(header)); } ImmutableMultimap<String, String> headers = headerBuilder.build(); if (response.code() == 204 && response.body() != null) { response.body().close(); } else { Payload payload = newInputStreamPayload(response.body().byteStream()); contentMetadataCodec.fromHeaders(payload.getContentMetadata(), headers); builder.payload(payload); } builder.headers(filterOutContentHeaders(headers)); return builder.build(); } @Override protected void cleanup(Request nativeResponse) { } }